81087876 has 18 divisors (see below), whose sum is σ = 204972222. Its totient is φ = 27029280.

The previous prime is 81087859. The next prime is 81087887. The reversal of 81087876 is 67878018.

It can be written as a sum of positive squares in only one way, i.e., 43560000 + 37527876 = 6600^2 + 6126^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1126185 + ... + 1126256.

Almost surely, 2^81087876 is an apocalyptic number.

It is an amenable number.

81087876 is an abundant number, since it is smaller than the sum of its proper divisors (123884346).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81087876 is a wasteful number, since it uses less digits than its factorization.

81087876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2252451 (or 2252446 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 45.

The square root of 81087876 is about 9004.8806766109. The cubic root of 81087876 is about 432.8312825962.

The spelling of 81087876 in words is "eighty-one million, eighty-seven thousand, eight hundred seventy-six".